Zipp39s exploration of the 303s wider rim led to the firecrest174 technology and now that development has come full circle with the 303 firecrest the new wheel features firecrests signature shaping designed to optimize both halves of the wheel which creates a rim that is significantly faster and also much easier to handle in crosswinds at just 1 310 grams the weight of the new 303 is virtually unchanged from its predecessor and remains one of the lightest carbon wheelsets anywhere